Hi,
I’m interested in this product.
MK163 - Electronic Stereo Volume Control Electronic Kit QUERY
I have a nice audio amp which I feed from my Philips LCD TV.
Irritatingly the line out from the TV is at a fixed volume level.
What I would like to achieve is to use this kit to allow me to use
my Philips (and or Sky) TV controller to operate this.
Is that possible rather than using the Velleman IR remote
Also is the quality of output signal affected a great deal
Thanks
M Stann
This unit only responds to the dedicated Velleman Kit remote. If you have a universal learning remote, you can learn the Velleman remote to the universal remote.
The audio quality is not affected by the volume control.
Thanks
Hi Guys,
I’m also interested in this kit. I also want to know :
1-The input and output impedances of the kit
2-Its noise level
3-What is the max and typical “gain” differences between the right and left channels ?
4-What is the THD figure of this kit ?
5-What happens if an input level greater than 2 V is fed to the circuit ?
You claim that this circuit has no influence on the input audio signal, this is also theoretically the case for any analog pot and moreover stepped-attenuator, but I noticed even for the most expensive a real incidence (i. e. degradation…) to the input signal. Then I’ll try a couple of these kits to check if there is or not any consequence on the output audio signal.
Thank you for your feedback,
Figures not available, this is a minikit, not high-end audio gear.
Volume control used is the TC9413AP, maybe the datasheet will provide the info you request.
However, at this price, you might just want to give it a try.
Merci pour votre réponse… Le fait est que je ne suis pas sûr que le circuit seul et le kit aient les mêmes caractéristiques, d’où la raison des questions posées…
Certes il ne s’agit pas d’un produit dit High-End, mais ce que je recherche c’est un produit simplement transparent. C’est pour cela que lorsque j’ai lu que le kit était susceptible de “ne pas altérer le signal audio”, j’ai tout de suite été intéressé.
Avez-vous fait des tests qui vous ont montré l’absence d’incidence sur le son ? D’autre part, est-ce-que le préampli dit “numérique” 4100 utilise ces circuits ?
Merci de votre support,
We have tested it and we do not hear the difference, but this is subjective, this does not mean that you will not hear the difference. The K4100 is obsolete and used a volume control from a previous generation.
After connecting my MK163 IR remote volume control, it worked for a short while, then produced a hum and stopped working, both from MK162 remote and local pushbuttons. I supplied the kit at 20V DC.
My input/output cabling runs earthing at 0V as normal, but I notice from the circuit diagram that pin 5 of the TC9413 IC is connected to both 0 ground and to the voltage divider circuit at around 3V.
All voltages from the voltage regulator are correct at 6V and 5V respectively.
Any suggestions?
Can I purchase the two IC’s for the MK164 kit?
Please note that the unit is rated for 12VDC. Make sure the regulators do not overheat and shutdown or behave odd.
Spare IC’s can be ordered from your Velleman distributor.
Thank you for the reply. I am however still worried by the earthing from the input and output cabling, which are inherently and invariably earthed, which connects to COM on the pc board and which effectively short circuits part of the 5V bus. Perhaps the input/output cabling screens (earth) should simply bypass the kit entirely ie. not connect to COM?
Regards, Leon van der Merwe
I’m sorry, but I do not understand.
How is it connected to a PC?
How can it short a +5V supply?
[quote=“VEL417”]I’m sorry, but I do not understand.
How is it connected to a PC?
How can it short a +5V supply?[/quote]
I meant kit PC board and 6V.
The input to the kit comes from my pre-amp, with pre-amp groung at 0v which goes to COM (VA) on kit. Similarly the output COM goes to my main amp ground, 0V.
The kit is supplied from my pre-amp 12V rail. with 0V at ground. This effectively ties 0V(GND), to COM (VA). But VA comes from a voltage divider supplied from the 6V bus (R1 and R2). The 6V supply is therefore connected to GND via R2 and R1 and C8 serve no purpose…
Perhaps the COM pins should connect to the kit GND circuit only and not to VA as shown?
Regards,
Leon van der Merwe
It is normal that the kit does not work if the VA is connected to the GND.
You will need a seperate power supply to power the MK163.
[quote=“VEL417”]It is normal that the kit does not work if the VA is connected to the GND.
You will need a seperate power supply to power the MK163.[/quote]
Thanks for your reply.
This will only work if your separate power supply and the kit are both ungrounded, a most unusual setup in the hifi world. Since pins 5 and 12 are analog grounds, they seem to be referenced to ground via R1 an C8, in which case the link between COM and VA must be removed. The point is that the analog input and output signals are all referenced to ground.
This also explains why my kit worked when tested from a battery but was damaged when connected as “normal”.
May I suggest that you change or qualify the circuit since buyers will invariably use the pre-amp power supply since the unit is intended for panel mounting and thus for installing inside the pre-amp case.
I find this discussion most enlightening and is in no way intended as criticism.
Regards,
Leon van der Merwe
If you use a separate power supply, you can connect the pre-amp ground to the COM of the kit, without any problems.
Hello there,
We are interested in the MK163 kit and the remote IR transmitters which can be used to operate it.
The remote must be capable of controlling volume (plus and minus) as well as mute (on and off).
According to info in some V catalog the K8049 can be used. It is however a 15 channels device which seems to be a little overkill.
(What we are missing is a cross reference table with IR receivers and IR remotes giving the inter usability, Suggestion ?)
We wonder which of the below remotes can also do the job ?
-K8051
-MK162
-Other type
Regards, John
Hi,
The MK162 adjust the volume up and down but no mute function.
The K8051 and the K8049 should give all functions.
Volume up, down and mute.
However if you are looking for ease of use the K8049 would be the best choice.
Hope this helps.